Yeah, I would say that deleting the "SSAC u-bend" and a vastly improved crossover, plus V-band flanges make it worth the money to get WBS, but only if you're lazy and/or can't weld stainless. Then it's still a couple hundred cheaper to go with the flea-bays.
Even if Mikey is just buying ebays and modding/upgrading them, that labor is what you pay for. I mean Clean's retrofit headlights are $250 in labor. It just depends on what you're willing to live with or how far you'll go for a nice finished product.
